Improvement in teeth for thrashing-machines



iw. WATE-R MAN. 1 Tee th for Thr'ashing Machines No.l68,305.

Patented Sept. 28

N PETERS. FHOTO-UTMDGRAFHER, WASHINGTON, D C.

. U D PATENT OFFICE EJQNATHAN w, WATERMAN, or onneon, WISCONSIN,

To all whom it may concern:

Be it known that I, JONATHAN W. WATER MAN, of Oregon, in the county of Dane and b State of Wisconsin, have invented a new and valuable Improvement in Teeth for Thrash- Zing-Machines; and I do hereby declare that s the following is a full, clear, and exact description of the construction and operation of the same, reference being bad to the annexed drawings, making a part of this specification,

"and to the letters and figures of reference marked thereon.

Figure 1 of the drawings is a representation ofa side view of my device, showing the construction and form of the blade, the shank, {and nut-bolt. Fig. 2 is an edge view of the a y same. Fig. 3 is a middle cross-section of the vsame, showing the re-entrant planes made in the sides of the blade, and their incline planes. My invention is a thrashing and hulling tooth; and consists in thenovel construction, earrangement, and operation of the same, em-

jbracing the following elemental features: A metallic, detachable, and reversible blade, Twith its sides tapering, like an ax, from its rectangular poll to itsconvex bit-edge, having f the edges of said sides convexo-convex, and a tapering back again from the said bit-edge to ;the said poll; also, having a portion of said sides each longitudinally planed backward flfrom said bit-edge almost to said poll, so as to i I form in each side of said blade--a middle cross 7 section of which will be of uniform thicknessi a re-entrant plane with a chamfered and deep- I fening edge Within and corresponding to the fsaid convexo-convex edges; and, finally, having said poll formed and extended, all in one and the same piece, into a square shank and it a nut-bolt, all of which and their purposes is hereinafter more fullydescribed, and illustrated by the accompanying drawings, in which the same letters designate identical f jparts of my device in the different figures,

- respectively. y

The letter A represents the blade of the said "tooth, its sides tapering wedge-like from its 1 :poll 01,, whichi s rectangular to its'bit-edge b,

which is dull and convex, as shown.

This

formation is to allow the concave and cylinder i [of the thrashing-machine, into both of which Qsaid teeth are. fixed, to be brought closely Specification forming part of Letters Patent No. 168,305, dated September 28, 1875; application filed July 16, 1875.

together when the thrashing of grass-seed, instead of oats or wheat, is required. The said edges 0 are made convexo-convex, and with the said backward taper from bit-edge to poll, for the purpose of allowing the thrashed straw to more readily release itself from the teeth,

when the cylinder has revolved to the proper position. Again, this shape of double-convex edge, and also the said double taper, allows the said edges of said blade to be reversed whenever, in course of time, the engaging edge of said tooth, either in cylinder or concave, becomes worn away. This Wearing causes said engaging edge to take the shape shown time they catch the seed when grass is thrashed, and also remove their hulls by trituration between the opposing sides of adja-- cent teeth in cylinder and concave. Said cavities f serve another equally if not more important purposethat of drawing air into the feeding end of the thrashing-machine, and

forcing it through and out of the tail end of the same, thereby carrying dust and other impurities out with the straw beyond the sifters.

The letter B represents a square shank,

which, with the nut-bolt O is formed out of the same piece with the blade A, extended from its poll 9. Said shank sits fittingly into a correspondlng depression, countersunk into i the outer surface of the cylinder on the inner surface of the concave, and there is securely held by said nut-bolt. This means of holding said teeth strongly and inflexibly in position is still further strengthened by the shoulders, 1 which are formed by the poll 0, at the base of the said shank 13. Therefore,

I claim- The thrashing and hulling tooth A, having tapering sides-from the poll wto-the convex hereunto-subscrib'e'd my nama-in-th'e presnc bit-'dgabfand the edges Ofsaid sides cdnof ltwo witnesses. Vexo-convex and tapering back again to said p011, and furthermore provided with the double. JONATHAN WESLEY WATERMAN' concaves or re-entrant plauesf, all substan- Witnesses: tially as and. for -thepurposes spepified, "EDWIRR. SHEPHERD,

In testimonytl'la'fil"claim theab'o've I h'avef O'A'SHORE. 

